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A directory of Objective Type Questions covering all the Computer Science subjects. 7) Difference between encryption and decryption . 1 INTRODUCTION • Security Goals • Attacks • Services and Techniques 2 CONFIDENTIALITY • Symmetric-Key Ciphers • Asymmetric-Key Ciphers 3 OTHER ASPECTS OF SECURITY Part 1 => Cryptography and Network Security - Introduction => The OSI Security Architecture => Classical CryptoSystems => Classical Encryption Techniques => Linear Feedback Shift Register (LFSR) => Introduction to Number Theory => Finite Fields Part 2 => Simplified Data Encryption Standard (S-DES) => Block Cipher Principles => Multiple Encryption & DES => Modes of Operation In this section and the next, we examine a sampling of what might be called classical encryption techniques. 8) Define asymmetric key. This set of Cryptography Multiple Choice Questions & Answers (MCQs) focuses on “Substitution and Transposition Techniques”. 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